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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b90b5d8479902f511108a7b0e858a1e4b80d835f248d751e7160eca8bfe0128d' 
  AND token = 'n2tP6h0r+o2TYANPbZB9yc094eXGQ8CdFe4+wXFIuQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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