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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '312bfa00285e317b3a9cac20a054507e3fe3322f9764d957ec771ba0842315b1' 
  AND token = 'Nc+dbd2j1D3lYGKmUaP9JdCswaSlQlBkBp2inshbPhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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