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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5d561aacca205d13170c2d4d00dbde66a0227426294bf5cff0017499bf5b5c3' 
  AND token = 'kC5e7eBY84BIjnn4PGA+zJm3DkOBr098j6C+iGGnOi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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