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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fff80092715e1616113861fdb38d89581be6bd528c4d0af9e1e6f13ec97eb28' 
  AND token = '54iakQY36kwZlSZKz8WTB+jHNX0PKWNf7fiELq1R+V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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