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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc86ff23dc4af397b6c3942088a8a91a51db10c87a842bc73238e237108daccb' 
  AND token = 'IRHPLyLpBzy5TGWrSoocjBVqin4fy5BFkf3qaynKiBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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