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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8d667d31ea1af898b3340f76a94756d05aa8f3953e6ef232dc9de04e070af8e' 
  AND token = 'B50kK3pKMI6oqStoHAGpFdqrGrfvmqvBQfaSJn1wLcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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