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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c71eee5cf8cce32ebe82a22b95efcfbf1aac23564fd6bb62f9efb7129afeb4fe' 
  AND token = 'U7h+jAaNo//nrlLakxrjHJaMjC8DW3jLn5D4y9ATLAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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