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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20b5563f01c554e8499ec05f3e702f2fff0f789cad85c4d2776c49b7d46d29bd' 
  AND token = 'q6+CxDtNt2dDkpYre9bfGmOYDoCoQMaqBkB6w/pxAao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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