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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28ebc2daa302b09210f51019c6d14168049b3d1c863224ebfc8c307ad513832a' 
  AND token = 'jaGGxZ/5G1L3casg+N7r6qqEElKbX3EHZXked8kvKyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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