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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '976a078ad2a69038a29857ac30c7cce6028ebbbfa08ccb5d2a10e89c98d478f2' 
  AND token = 'vCKesD2NN2TmQ8aygCzYx7iTlANSTmBH7PCr07BGiCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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