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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a838887639692023563a950800beb2feb3c2e9dc01be12e377ba7f7cd2307a01' 
  AND token = 'mIa6T1izD/jkPwwNOJ48KZhI5W8sM3QdboSfRtBkLtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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