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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c419febfe4f26afef9368632fd5106147fb3db948d31c77b8c251c5d8f382a02' 
  AND token = '7+KKomX1++3yoFMRW1i0N2gO4mFSHysroi+HsUd4oFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}