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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b80031e186cce98a2982c25c6886164c522e0c52c5d6380b35b77f60cf90b8f6' 
  AND token = 'pRmsI801RttuhsUbME/nfM7wCv1c9qVLyE3eIBzXlv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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