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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bcb9781cceb3a9728ee0aa3310d409a3ff72a9ed41f94c8e00cea44daa4bc8d' 
  AND token = 'c55g4ZMAkLREv9C6jfaGefSlcOz77zJlfs8IQ6l0MUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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