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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a2282ecb9fe5e71f9822572e9ea9d1ed85477b3f767fdf5fb685ba249db719c' 
  AND token = 'aaQ8n1LLen+hqqxQmXx67HWPYvpCthVHGF3y1xlP1yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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