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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5315dfb8410d790515514522c1be40c91efcfc5e0d1979f6873613fc2d1f1d47' 
  AND token = 'zrix1SbQXdvPyB1aSne4FO26h6GKIWOPSAm8X8aeuBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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