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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '216cffa7af311ac7be4beb29cffda2aee5b735461b2ced8553168d8b89924e0a' 
  AND token = 'ASsfrufd/lwUhyrpcGNCoqp9YheuZr2q0F+x4lPfMLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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