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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45bfa7283b766acb4aa3741ea1e03bed7a397e1b47454e48f770e5816173f8f3' 
  AND token = 'pk8s04zIDdFfr7lDotcmpen4YTgdMRQGX7sDDWSQmFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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