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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5acfa134fd7fbfe5f2a3b3484022281d4cff94003596115f3b2d83f060b8956' 
  AND token = 'u+jof0cXDziTnq1RGR1fjO+OzdZjXFXie0b+fB4fNY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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