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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a564d927e3611bb34ee9656e49e8b68412d22f0b4d37620d2e57d6c027606f6' 
  AND token = 'haNnnpAyPlWpUyMrPufHOSkDqktGi9myTnWIT6eMAFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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