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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f20ab1825e4a653f89bca5176437b87cc4a3ad7e849da23f4fcd8f257cc207cc' 
  AND token = 'uxZrI608kBZrvaZaqyF+O6UmW5ZBBmLvuEoe5X21ino=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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