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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a80bf1cad0345544a52def5edcffbc5a44b84b3a19b3c96f3c3e913e1fe9613' 
  AND token = 'jrn0A3qN8ouxWm6mdmvdwTTuYOw947VEBdABv4CKcAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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