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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04237a1721890bcd962ef20f84df197f2dee47c731a56a28a8e5588f0fdea3fb' 
  AND token = '+yCHdJGexz89u0sx91wTkNisWLgPcBa7Bqij1pVAHEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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