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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a011c4f92f8a10c00bb970b28b83685c5089f2f2f05a6e68083e02bd337d4760' 
  AND token = '6TJUvXcbOxhd97MhsigoEyByEfUsrhNGvCaBIawTPHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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