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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8c7ca43099a2a82bb0f1e273f3a3c0baba150a72fe60908d10cb535bcfeebc0' 
  AND token = '+3xlWIFgm86PRCYPkAxGs1D+FQqwSNqkaxG+SEnoudg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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