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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1346630c73c707e14f3bc9ae50b775899c844a148d7d5db652d7608341ea62bc' 
  AND token = 'gIsHXZ9SjgjMSrqcj7YEAn+k6cAYeREDMPPbrezfVkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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