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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ea891d6f20d2680a9e8ae0b2f27c8195c5fc8540c7e6b3e3c9c532ed26ef395' 
  AND token = 'Zgv9gXZSGRaesT4uJg9BHHRQFpcZfgOvBcbDThjotCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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