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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '570bf5fd4dc03e82ce0d24f9dbc5c05f5990f0c968c432b2036f7d52d419584b' 
  AND token = '2HXhuf1gHDU5dk+dmfMjUOmXTb5bZt4rejyogm1kMH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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