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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23c3b5f0a1a5c9f7adb19e01cdcfb904f53fc35bb2af1ac3f90ac17265dd0ec3' 
  AND token = 'MZe8jnoe0qiWQLqMX4kwIk/rg9zUFyt+opsNEedlUZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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