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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55c48ca117760d7f37c73f882449418a5ec33dd5a0f06fb3b5b38cc1d69cba34' 
  AND token = 'eS3YpBEnwgaP9x6i1ayvQOBHtyDWaKP06XnnTdf/M04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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