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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '358bb276f8c2d5d06aff0abfa0329de738e40468e508d3a3a593a2cee25e2adb' 
  AND token = '23fSqI4r4X3tn2JKdntLj5ByK52sqvcc7W8hCFZ2jFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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