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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2302fa2d760f3ca6c1c6af34f2678785004ad23a8d187d3c83295257f4e833e' 
  AND token = 'pYawq+mPtb38LxW5p3TUz9z44DUK8nBBUOh4O0n12A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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