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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb7933f8e11c737aee52ecef7259b8e3713a1bb76a90ae8302234401dd6d148b' 
  AND token = 'pEd3I5Dh8AcI485f/BW42v4Mr4/d6UT0rNFvkXhC4HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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