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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41404c2fb4923e69b6a0045139a5a701b1c3dd73370d7e9acd711eaa24817613' 
  AND token = 'Nm4kNrvrGrnB5Lys8hKTyzX4E9121mcGsFnz7sOMIvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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