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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a29d87074842d5c331a5a7ed4d3e9ee98a09f4c939f12ebc60794128b58c1ff' 
  AND token = 'aLprpbw7H5pJyQduBGKlNaGo1Lbu1s6jhXj0bG3Sn5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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