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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc2239ab5cd6fa3b3c725022ea381b51d9c69633d2ba9ae3a88178824853b10e' 
  AND token = 'W6MVd3jTlrOYj1VVR5whSB+wY7Q/ewp9AU4D6uYwMEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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