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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0e2b175c4c03a62a9db31cbb5e9aaa079efcf61b4d7e025b4d482b44f76d02d' 
  AND token = '2/carVW/sOPnndbHZGmbQPPX8dmGK1Jz0psUaXufKig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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