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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4529b50f57003e6b3adc4454f0cf66f1f026c3a6be6ac6300705206991bbe95c' 
  AND token = '68ZMHis8GSXi5dVCgON3yYpLFii2SXqqH1Pmi2YDRbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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