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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eda7ce119dd26e543ecca91332566464bf2abc34ab8b90a6306da0be16c62fb9' 
  AND token = 'oLZGLNCySimXXLs2ya+Q27GSjsW2LvKn7jc1iMc10JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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