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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '286dac6df8523721184c15a90368902d3ea30f4a7b4f9a0f1f6903a6d9ba9939' 
  AND token = 'Sqc5DdnHSi9ZQwEoPnD16iUg7zX+yqJuG2JkDImr8qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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