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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a1b100a9b040eb74cc7078a926ce273f20533953fc8173460717dee3090d598' 
  AND token = 'p0js1N0l6IF9YyU4N9opqqgK+QVPh/j2Z0RHl7aVSB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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