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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6f56184f434975ce15e6dfd380a6c062f5b9405230e24dabf3dc9d780f246ca' 
  AND token = 'kNUAm1cAhmr4pHNxR15WPTDKbxktHHdm+QOmbKmmckY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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