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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9fc38e7aed1ab74a7ec8ab5a0a330c3a9302e5c223b3daec6907756fc58afd3' 
  AND token = 'FVpNBcRaqN+mcFwztRT6i+oDqmkOL3F1PM3kzWomyy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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