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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58b33d3a0285b8a741ffcda383645998dda1e15be3a81179b8e65164268e213e' 
  AND token = 'F0qfvfZuCQCO9bSaULl1+qttMF3v/lGcm9RY0M4R8Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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