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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bf2f0c62795c538ab73814b4134ec0a6d3cf3a56e45756e002e3a364a870dc9' 
  AND token = 'MkV+Fdl4Su3Yunc0Wlo0ZxrwFV6NLVz6Dhb2cIzC+II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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